Synchronizing switch



P 1931. G. E. JANSSON 1,825,150

SYNCHRONI ZING SWITCH Filed March 30, 1928 Patented Sept. 29, 1931 UNITED sryrss PATENT OFFICE GUSTAV E. JANSSON, OF WOLLASTON, MASSACHUSETTS, ASSIGNOR T CONDIT ELEC- TRICAL MANUFACTURING CORPORATION, OF SOUTH BOSTON, MASSACHUSETTS, A

CORPORATION or MASSACHUSETTS SYNCHRONIZING SWITCH Application filed March so, 1928. Serial No. 266,065.

switch which carries high tensioncondensers 1 that are connected separately to the terminals of the switch and to each otherand to the ground: and have intermediate terminals which are at some voltage intermediate line voltage and ground, the condensers serving as surge arresters to'prevent surges, which "frequently occur during the normal operation of the line and also during the operation of the switch when the lines are not properly synchronized, from damaging the high tension bushings of the switch; the condensers also serving as electrostatic potentialtransformers and providing at their intermediate terminals reduced voltages which are proportional to the line voltages for the primary purpose of actuating synchronizing v indicators to indicate the synchronic conditionof the line. The combination of the synchronizing switch with such condensers,

as an integral structure, constitutes a further object of the invention.

Another object of the invention is generally to improve the construction of synchronizing switches. V

Fig. 1 is an elevation of a synchronizing switch embodying the invention.

Fig. 2 is a sectional elevation through one of the condensers of the switch.

' Fig; 3 is a diagram of the circuit connecthe other to the other switch terminal 16.

plates and their dielectric and forms one a terminal of the condenser unit.

hers 18. A movable switch member 20 co operates with said fixed contact members to control the circuit through the switch. One of the separately energized line sections 22 is connected with one of the switch terminals 14: and the other separate line section '24 is connected with the other switch ter- 'minal 16.

In accordance with this invention, the switch is provided with two condensers 26 and 2'4 both of which are carried by and connected electrically to the cover 10 and one of which is disposed adjacent and as close as practicable to one switchterminal l4 and The condensers are similar.

Each condenser comprises an insulating porcelain shell 28 of suitable height having petticoats 30 thereon. The lower open end of the shell is secured to and is received Within the upstanding annular flange 82 of a plate Set which forms a closure for the lower open end of the porcelain shell. The upper open end of the shell is covered by a cap 36.

The condenser comprises a plurality of condenser units 38, four being here shown. Each condenser may comprise a cylindrical metal shell which encloses the condenser 80 An insulating bushing 40 upstands from one end of the unit and is provided with a terminal 42 that constitutes theother terminal of the unit.

. The capacity 01 each condenser unit may be any desirable value and the condenser "units may be connected together in any detsirable manner. As here shown, the four condenser units arearranged 1n superposed order withinthe shell 28 and are connected with the bottom of the metal shell of the next upper unit. The shell of the lowermost unit is electrically connected 'withthe plate 34, which forms a low tension terminal of the condenser. The insulated terminal of the uppermost condenser is connected to the' cap 36, which thus forms the other, and high tension, terminal of the condenser.

Separate low voltage terminals 43 and 44 arebrought out through the Wall of the shell ma 28 and-are respectively connected to the insulated terminals of the lowermost and the neXtupper condensers so that'the voltage 1 is sutficiently great, and the condensers are very close to the switch terminals to absorb be'integral with the cover 10 and the plates 34 of the condensers are bolted to said brackets and thus are electrically connected therewith. The condensers are thus disposed as close to the terminals Hand 16 of the switch as is practicable and are connected to the lines 22 and 24 by conductors 48 ahead of the switch terminals. I

The casing otthe switch is grounded by a connection not shown.

Thecapacity of the condensers '26 and 27 dangerously high voltage surges that may be present in the lines 22 and 24, caused either during normal operating conditions'of the line or by the closing of the switch when the I linesare not in suificientlyclose synchronism.

' The condensers, by absorbing or drawing off the peak of the voltagesurges, thus protect theinsulatin'g bushings of the switch against break down. 1

-A' synchronism indicator 50' which may be of any well known type is adaptedtobe connected by leads 52 and 54 to a selected one of the terminals 43, 44 of the two condensers 26 and 27 respectively and also by alead 56 to the grounded and interconnected ends of the condensers, whereby it can indicate when the line sections arein synchronism and when the switch can be closed safely.

The plurality of low voltage terminals with which each condenser is provided permits the selection of a potential suitable for operating the synchronism indicator.

The lowpotential terminals can also be utilized for the energization-of other instruments and apparatus such as voltmeters; and the capacity of the condenser is suificient to supply a substantial amount of power, so that relays and other low-power consuming apparatus can be operated. I By having'the switch provided with a condenser for each terminal thereof, the line on both sides of the switch is protected against surges, even when the switch is open.

I claim: h

1 1. A high tension synchronizing switch having insulated switch terminals and a pair of surge absorbing condensers carried by the switch in close proximity to said terminals,

- said condensers having high tension terminalsl'connected each to the circuit of a switch terminal and low tension terminals connected together and each having an intermediate low voltage-terminal.

2. A synchronizing switch comprising an encloslng caslng havlng insulated terminals, condensers carried by said switch casing in close proximity each to a switch terminal and having high tension terminals which are adjacent and are connected to said switch terominals and having lower terminals which ar casing having-upstanding insulated terminals, upstanding insulating ShBllS carried; by said casing each ofwhich is in close proximity with one of said switch terminals and has an upper high tension-terminal, each shell having a plurality of connected condenser units. contained therein whiclraige connected respectively tofsaidlhigh tension terminal and to said casing and an intermediate low tension terminal connectedtofone of said condenser units,

5. Asynchronizing switch comprising a casing having upstanding bushings provided with upperexposed switch terminals. nd upstanding insulating shells carried by said casing, each of whichyis in close proximity with aiseparate one of said bushings and has an upper hightension terminal located in close proximity with one of said switch ter- I ing plate at its lower end which is connected with the'caslng and constitutes a low tension IGI'Hllllill, a plurality :of connected condenser units contained in each. shell and connected between said high and low tension terminals and each of said shells having an interme-- .diate low tension terminal connected between saiclcondenser units. 7 V

6. The combination of two separately energized sections of a high tension alt rnating current line, apparatus for conncctingsaid vsections together when they are in synchronism comprising a switch having two tenninals each connected with a separate one of said line sections, and grounded condensers each separately connected to a separate one of said sections at a separate switch terminal, said condensers having such high ca acity as to absorb surges that may be set up y the closing of the switch whenthe sections are not in precise synchronism and to prevent .iSllCh surges from going out onto said sections. 7

. 7. The combination of two separately onergized sections of a high tension alternating current line, apparatus for connecting said sections together when they are in synchronism comprising a switch having two terminals each connected with a separate one of said line sections, and grounded condensers each separately connected to a separate one of said sections at a separate switch terminal, said condensers having such high capacity as to absorb surges that may be set up by the closing of the switch when the sections are not in precise synchronism and to prevent such surges from going out onto said sections, said condensers also having intermediate low-potential terminals that provide a low voltage that is a function of the section-voltage.

In testimony whereof, I have signed my name to this specification.

GUSTAV E. J ANSSON. 

